Kabushiki Kaisha Kobe Seiko Sho

Hideo Mori

Kenzo Ayata

Masaki Nitta

Susumu Ishiguro

Hitoshi Nakata

Takeshi Inoue

Method of continuous casting of molten metal

In a method of continuous casting for rolling down a cast strand at the final stage of solidification to reduce segregation and center porosity at the center of the casting as much as possible and in particular prevent spot-shaped segregation, the rolling down is started after the center solid phase ratio of the casting reaches 0.2 and the rolling down is executed so as to compensate the total amount of volume contraction by solidification and cooling of strand in the section of the rolling down until the center solid phase ratio reaches 0.9 and thereafter the rolling down in continuously executed by a rolling down gradient of 0.08%/m or more to 1.5%/m or less.

Method of continuous casting

To provide a continuous casting method to diminish as much as possible center segregation and center porosity in the center of the cast piece, structure, a continuous casting method includes the application of reduction to a cast piece in the final solidification stage of the cast piece draw out process of continuous casting. The reduction is commenced at a point after the center solid fraction of the cast piece has reached 0.2, and the reduction gradient is decreased as the center solid fraction grows larger. The enlargement of the center solid fraction is divided into at least three zones with an optimal reduction gradient (%/m) established for each of the zones.

Continuous casting method

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Kakogawa, Japan

Hideo Mori